One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,7)(5,6)(9,10)(11,14)(12,13)(15,16)(18,22)(19,20)(26,28)(30,32) involution — undirected(1,3,6,4)(2,7,5,8)(9,10,13,12)(11,14,16,15)(17,18)(19,24)(20,23)(21,22)(27,31)(30,32)(2,5)(7,8)(10,12)(14,15)(17,19,21,20)(18,23,22,24)(25,26,29,28)(27,30,31,32)(1,4,6,3)(2,8,5,7)(9,11,13,16)(10,14,12,15)(17,20,21,19)(18,23,22,24)(25,27)(26,30)(28,32)(29,31)(1,5,6,2)(3,8,4,7)(9,12,13,10)(11,15,16,14)(17,18)(19,24)(20,23)(21,22)(25,28,29,26)(27,32,31,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.